I found when I was very addicted to facebook that if you turn off all mobile notifications and don't have it pull for updates, since I wasn't getting any notifications I wasn't checking as often. This eventually led me to be okay with not opening the app to check something and then lingering on for a while looking at the same thing over and over again. That's how I was able to become facebook-free. It's very similar to other addictions, if you see less things that remind you of it, it'll help you in the long run